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6ce9ff81e7## Summary Add `maxRequestBodySize` parameter to `StreamableHttpServerTransport.Configuration`, allowing consumers to set a custom request body size limit lower than the default 4 MB. - Add `maxRequestBodySize: Long` property to `Configuration` with a default of 4 MB (`4,194,304` bytes) - Replace hardcoded `MAXIMUM_MESSAGE_SIZE` constant with the configurable value in `parseBody()` - Use `Long` for content-length comparison to avoid `Int` overflow on large values ## Motivation and Context Closes #521 The `StreamableHttpServerTransport` has a hardcoded 4 MB request body limit. Consumers who need a lower limit currently have to manually count the request payload size before passing it to the SDK. This change makes the limit configurable via `Configuration`. ## How Has This Been Tested? - Existing unit tests continue to pass (default 4 MB behavior unchanged) - Added `POST with custom max request body size rejects oversized payload` — verifies `PayloadTooLarge` is returned for payloads exceeding the custom limit - Added `POST at exactly custom max request body size is not rejected as payload too large` — verifies payloads at exactly the limit are not rejected by the size check ```bash ./gradlew :kotlin-sdk-server:jvmTest --tests "*.StreamableHttpServerTransportTest" ``` ## Breaking Changes None. The new parameter has a default value matching the previous hardcoded limit. ## Types of changes - [ ] Bug fix (non-breaking change which fixes an issue) - [x] New feature (non-breaking change which adds functionality) - [ ] Breaking change (fix or feature that would cause existing functionality to change) - [ ] Documentation update ## Checklist - [x] I have read the [MCP Documentation](https://modelcontextprotocol.io) - [x] My code follows the repository's style guidelines - [x] New and existing tests pass locally - [x] I have added appropriate error handling - [x] I have added or updated documentation as needed |
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